MHT CET 2023 Physics question
An electron makes a full rotation in a circle of radius 0.8 m in one second. The magnetic field at the centre of the circle is ( SI units)
Answer: (A)
Solution
One revolution per second means an equivalent current . Field at the centre of a circular current loop: \dfrac{μ_0 I}{2r}\dfrac{4π×10^{-7}×1.6×10^{-19}}{2×0.8}$ =
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